chromeos: Backspace and enter key works as intended.

chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js

Index: chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
diff --git a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
index 90cf289bcb905ff3771653ffc354009b882d6b1f..f97522d1ece5cbd703935843ef727b50225405d8 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
@@ -93,6 +93,16 @@ Polymer({
   },
 
   /**
+   * Removes the space/enter key binds from the polymer iron-a11y-keys-behavior.

[jdufault, 2016/09/22 20:04:01]

I would move the function comment into the function itself (above line 100) and
just have /** @override */ here.

[sammiequon, 2016/09/22 23:15:48]

Done.

+   * @override
+   */
+  attached: function() {
+    var digitButtons = Polymer.dom(this.root).querySelectorAll('.digit-button');
+    for (var i = 0; i < digitButtons.length; ++i)
+      digitButtons[i].keyEventTarget = null;
+  },
+
+  /**
    * Gets the container holding the password field.
    * @type {!HTMLInputElement}
    */
@@ -209,7 +219,7 @@ Polymer({
   /**
    * Keypress does not handle backspace but handles the char codes nicely, so we
    * have a seperate event to process the backspaces.
-   * @param {Event} event Keypress Event object.
+   * @param {Event} event Keydown Event object.
    * @private
    */
   onKeyDown_: function(event) {
@@ -243,6 +253,21 @@ Polymer({
       return;
     }
 
+    // Space pressed.
+    if (code == 32) {
+      // Check if target was a number button.
+      if (event.target.hasAttribute('value')) {
+        var numberValue = event.target.getAttribute('value');
+        this.value += numberValue;
+        return;
+      }
+      // Check if target was backspace button.
+      if (event.target.classList.contains('backspace-button')) {
+        this.onPinClear_();
+        return;
+      }
+    }
+
     this.value += String.fromCharCode(code);
   },